Red Grapefruit Marmalade: A Sweet & Tangy Homemade Recipe

Start your day with the vibrant and zesty flavor of homemade red grapefruit marmalade. This bittersweet preserve boasts a rich texture that pairs perfectly with fresh bread or creamy cheese. The unique grapefruit, with its characteristic bitterness and tangy twist, transforms into a surprisingly delightful star in this easy marmalade recipe. Making red grapefruit marmalade is a wonderful way to use seasonal citrus fruits and fill your kitchen with the comforting aroma of homemade goodness.

While English clearly distinguishes between jam and marmalade, Hebrew often uses “marmalade” for a candy made from fruit pulp, cut into cubes, and coated in sugar (unless you’re buying the commercially produced version with artificial colors and flavors). In contrast, “riba” (jam) generally refers to any product made from fruit and sugar in varying ratios.

Red Grapefruit Marmalade

In English, however, marmalade specifically refers to a preserve made from citrus fruits, while jam is made from other types of fruit. Marmalade typically has a jelly-like consistency and often includes the fruit’s peel, which has been treated to soften it. Because of the peel, homemade grapefruit marmalade will have a pleasant, subtle bitterness that, when following the instructions, is far from unpleasant.

So, it’s time to sterilize your jars and get ready to make delicious red grapefruit marmalade!

Homemade Red Grapefruit Marmalade Recipe: Tips for Success

The key to successful red grapefruit marmalade starts with sourcing good grapefruits. What makes a good grapefruit? Look for fruits with relatively thin skin. Since the entire fruit is used, the thick skin can result in excessive bitterness.

If you can find organic, unwaxed grapefruits, that’s ideal. Otherwise, simply wash the grapefruits thoroughly with warm water and a scrubbing sponge to remove any wax coating.

Red Grapefruit Marmalade Ingredients: Sugar Ratio

Don’t be alarmed by the amount of sugar. In most of my jam recipes, the fruit-to-sugar ratio is around 600 grams of sugar per kilogram of fruit. In this red grapefruit marmalade recipe, I use 1.8 kg of sugar per kilogram of red grapefruit, but there’s also 1.5 liters of water that will turn into jelly during the cooking process.

Note that this quantity will yield 6-7 jars of 375 ml each, so feel free to halve the recipe if you prefer a smaller batch.

Do You Need Pectin for Red Grapefruit Marmalade?

No! The peel of the grapefruit (and all citrus fruits), especially the white pith, is rich in pectin. Therefore, there’s no need to add extra pectin when making this.

Preparing the Grapefruit for Marmalade: The Soaking Process

Before cooking the marmalade, I soak the cut fruit in water overnight. This soaking process is responsible for two main things:

• Softening the Peel: Soaking in water helps to soften the grapefruit peel, allowing for better sugar absorption.
• Releasing Pectin: During soaking, some of the pectin in the peel is released into the water. This helps achieve the desired marmalade texture without hours of cooking or added pectin. It also helps preserve the natural color of the grapefruit and prevents the sugar from caramelizing and the marmalade from turning a caramel color.

How to Cut Grapefruit for Marmalade

Take about 4-5 grapefruits, roughly weighing one kilogram.

Cut each grapefruit into quarters. Using a knife, cut away the white membrane that separates the segments and remove any seeds. Divide each quarter in half again, and then slice the segments into pieces about half a centimeter thick. Don’t worry about perfect uniformity; I won’t be there to measure your cuts!

Place the cut grapefruits in your largest pot, cover with 1.5 liters of water, and leave to soak overnight (or for at least 12 hours).

Cooking the Red Grapefruit Marmalade

Wait! Don’t turn on the heat yet. First, take 2-3 small plates and place them in the freezer. These will be used later to check if the marmalade is ready.

After soaking for 12 hours, bring the pot to a gentle boil and cook the grapefruits for about 10 minutes over medium heat. This step further softens the peel, in addition to the water soaking.

After 10 minutes, add 1.8 kg of white sugar and the juice of two lemons. Increase the heat to maximum and begin sterilizing your jars.

In my recipe for [Strawberry Jam – link to your strawberry jam recipe if available], I outline three methods for sterilizing jars. Each method has its advantages, but when making a large quantity of marmalade, the easiest way is to place the jars in the oven at 150-160 degrees Celsius for half an hour.

The marmalade will begin to bubble vigorously. When the bubbling appears thick and strong, it’s time to check if the marmalade is ready. Cooking time from the moment you add the sugar can take 20-30 minutes, so after 20 minutes, it’s time for the first check. Reduce the heat and pour a small amount of marmalade onto a chilled plate from the freezer and wait 2-3 minutes.

If you have a sugar thermometer, the marmalade should reach 105 degrees Celsius. Overcooking can damage the pectin, potentially preventing the marmalade from setting.

After a short wait, run your finger through the marmalade on the plate. If the track you create doesn’t immediately close, the marmalade is ready.

If the marmalade doesn’t set, let it cook for a few more minutes over high heat and repeat the test.

Note that the marmalade will still be somewhat liquid at the testing stage. It will only reach its final, jelly-like consistency after it has cooled completely.

How to Store Homemade Red Grapefruit Marmalade

Remember those sterilized jars you have in the oven? If not, make sure to sterilize them using another method.

Now it’s time to fill the jars with the hot marmalade.

Go to your local discount store and buy a simple plastic funnel. Using a knife, remove the bottom part of the funnel to create a wider opening that can sit securely on the jar’s mouth. This will allow you to pour the marmalade without getting the jar rims sticky.

Immediately after filling, invert the jars. This doesn’t create a vacuum seal, but the hot marmalade will kill any bacteria on the lid. The vacuum seal will form as the marmalade cools and the volume of steam decreases.